11 watts , 1200 square ft . Use this solar roof / attic vent fan to keep your attic and building cooler in summer heat. It uses energy from the Sun to help keep the inside cooler. It operates without fuel, waste, or pollution and is wind, hail, and impact resistant. This solar attic fan needs no household electrical wiring, no battery to change, and no electrical bill to pay. It is easier and...11 watts , 1200 square ft . Use this solar roof / attic vent fan to keep your ...